<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <style type="text/css">
        div
        {
            width:200px;                       /*div元素宽为100px*/
            height:80px;                       /*div元素高为60px*/
            border-top:4px solid red;          /*上边框样式*/
            border-right:4px solid yellow;     /*右边框样式*/
            border-bottom:4px solid blue;      /*下边框样式*/
            border-left:4px solid green;       /*左边框样式*/
         }
    </style>
</head>
<body>
    <div></div>
</body>
</html>
